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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77ff0cd54c892ddccceff9766ada16617ae5509f893e0da2d5d1ecd2a3ade92c' 
  AND token = 'rPEQPCXb6tav+MjYZ2cyMYAcFm4AafnX7/T0TRVJ6H4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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