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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b95001fe164fc33ecec529acf69db7fb524918525f1846651a835c8a90f5b221' 
  AND token = 'LqV6Pe08D0C+q69PwGLcAeTPicwnlP1Je/llgoAL6oI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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