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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa1bcba3861a13c25d1c3ad5a86e8b0202fc4767e7229dd405791b7d7543ea66' 
  AND token = 'q6BC88ei9BNsb5baVbDrO6wit/5x2QnwnDGDUysWIbY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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