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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a07e7eb4d4b4bfad783a64ebfed5390c021ce177a1955c00852636a723a8626b' 
  AND token = 'qB1nDXlQS7Yuof4HqNsCiHHPEZKhLeaJbiBMQvUs1ms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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