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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2a18afca024e4dbeee6280768ebfe9c0047b0d09b8aadc1cd8aa7d645fd7d99' 
  AND token = 'Pju7HhBvc1bKFV4+dSxmL6fybepTp3wzY1TI4gbj3c8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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