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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c42c11f54f38e57ac477b8c9d78f7be4fcf3dda85d06faab06ceab375d117be8' 
  AND token = 'pg3Gu35O+YDpoTLj3RvkPknEdU8wqJydQKwDfczhXpc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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