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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2bab303c717e34dd80c0544455694157ae4972a8c18ae8dd78c47dd6472eede' 
  AND token = 'EgCpWd5Eu4XwGN8dZ250O2rCiqDSA7s5S1V8VHMdtjk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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