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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '207835ad1845b5ea432898e8ca2712f115bf84eedc8b055a3f8c6b64fd0eeaba' 
  AND token = 'F6pDnuXOz2RhYGMZyN3mB2C/YcVecpa67lQYCICIi6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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