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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddfd077d86dd6744405453b3fb19d754964a0bff34e15a8d6de1f3f7f82c14ba' 
  AND token = 'KfZBn9gz4LH/9ygUP/1Zkd1id32M5YrejLWG6/BIvyg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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