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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9c6096d8034b5516926e7f1dd05931b51255c510c2c710c72fc823e849086a9' 
  AND token = '+GPKXOBapMqVdhX5y1mn+kripNCkq8qJ7BV8KtG6FjA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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