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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'effc0f3000c9983cedc440107ac137d8213bca350a665f6a038531de6d67e286' 
  AND token = 'Ot+fAFNEFam2mlwJqPo7r1KrPGIuzILiUpz++ng8Mw4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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