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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '857f3bfc46137dac85fe71a6df66312f3ae7e2e1ba7b309a8025a1653eb14f5f' 
  AND token = 'J5JyVji9bH4P7lcqkNht0ATfKt+Y8fDlf5frOILuaBQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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