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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6721da0ca292cc85ee7b2019f266689efdeddffb32efb9f2e4115481ebe7a0f' 
  AND token = '2of0meQJ4ep9L3zcmgktbk2+BovhJ085jsg2+hhwQes=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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