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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '418b9ec37148e96b756d2c0d5cdb9f4d32902b34b5e709ca96fde94f858c6cc5' 
  AND token = 'ORsw6fxplXIdFhiUCZNmz4dpXF15OEWQEyTzNeKRVak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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