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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbab929ee2fb3a806b56196c300747a1ed62371be1a94b97e9065795045e932d' 
  AND token = 'wzSESbYmhbdldNbpIdFSRWm8wtj5QtRLh7u1CvCZLog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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