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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ea99472a392fb24c24abde3c4224ec350b4f5b1251684110d26455b9ce91d58' 
  AND token = 'Csii71DlnGHAuzk0bVL82F6yvreYtUyUizLrRiGJNbE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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