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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93526a2f29026d1891a24828ae4e7c09e0c2916d4d3cd44952d65ad6a9cbcf49' 
  AND token = 'S7w3SVrI5T2nlVgHWJA8GVUSafXFLrxpKwXDorEYUZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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