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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50e68ef4dd64992c34042f36187843a64bf6e91d2de087adf026e3f8493e5881' 
  AND token = 'zREwRQdzk4drVAbZqsVpwnAMQPRKgsT1iYaA7c5SUWA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00077

JSON explain

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