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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0179dd669ebc0f57ffff6298a2f27e497b91ffbd0362db33e0b8aef83d1605c' 
  AND token = 'ivJkY59aM/Y0BVuD1/94PdtNX8HdcUJJgrBpKGQU0V8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}