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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f425a3e7bbf456ab1cc26fdac9f51c67750fe33755f6613da7c0a5ebaab8142f' 
  AND token = 'bEF7Bz22QGHt0G+Joi0K96vfWMS/KeXc2CXWP061stg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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