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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c4b9d25a8c0483604d5cc89f64376442cbdb2155293cddf393881bf21fb3aa0' 
  AND token = '9etyw+iZ++VeJSF39j027KrqdCeUwrKcCx1q/N6k5o0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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