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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d9bd7a359ec1a66a35420fcff46bc4c1a1efff33032e9fd0bd043f4002fe950' 
  AND token = 'hCg/We4VKVK04hzabw5V0I6ci48yFfiKG5TjMymNkWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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