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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72d504767eec303736d6f0828dd8fb76ba6f5f1e0e794d4284e28abfa0e52053' 
  AND token = 'BtgWZEMaZiRO2aG8R13u28+rQYVM5ycQViB6fwuolMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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