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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b3f4d97d038ab790450c26cfbe88c133e4b1251ebc06920dcc74b118a883697' 
  AND token = 'kbhW10DLOgmAA/a//dkQKv2EzTz6orTCeFpdTt5MJZ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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