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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b950c6662d0a5bfe7a06f790c77b8cf3da46e9bfeca35913a2a57d58f50cf275' 
  AND token = 'UU8CgYw2Uq7gxzcPRJqqqf0TOtIz3jTT2uabYcqtncg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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