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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6af58ac876067069efbe1ec6e560da81a55cdaaf2d2a51729c92c3cf47e6b3c' 
  AND token = 'rkg/lMvHvHzKDii6RCLORwm1axXBkeZ7aaR6nXl/LO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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