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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f2bd165d87d578ecb1a88ff597d43138b881814063c73cea0e35a7b923fec37' 
  AND token = 'W/z47YZl2+DkJYoCRHQXScw6EBd1Na2aTJEMsFIS3dQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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