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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6ab79da42ab773884db97feaca8d6f7c62dfc1adec206b872ad44694254b787' 
  AND token = 'Va9JMQr9PzdCWCErk5uR8KyPiJEg3YgmBxvqpBYAfOg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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