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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76abf3e8e6edaedcd1cbc591b01b87e750d14380755a42b191919ad17d5b7d74' 
  AND token = '/yqajKjuCRuu9f6kccfqwfpSN4sVOXGsL3Cr0Pxuqho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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