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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43f3feb74416a734b0c85fb27d709c6a98c81a189b9bbebe2a7b0a2d355534a2' 
  AND token = 'jUW0f4v81RPcfPNfFQtK6KXaWn0xWj5ndgdpctIXoto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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