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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41693b6d8adf042a20ea577d78a1d6d05c085665ef79116f2050572c4b1de0f6' 
  AND token = 'JCH7BlfS71rP6sMT2Vda46NBpHSwQTkN4Qy3UaGhojs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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