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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f944b94c62781cedae1df9b7412f2c7d417dd663ee6c00d307e63bb57825451f' 
  AND token = 'aJNzkRfUECFTnp0EDdnyKeeC9HN3BpKvnz+LI9lllM8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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