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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f1bee85cb757b82e01fbfa12e07233572c92a90f28fdbbd8a3b669e02dfabcd' 
  AND token = '0Dep/YhS9H0cZh4NK3NAYtivN205if7am7xW0NUk2Qk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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