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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9091126a2825debe41dca1086cad97fdf0fd575606d5c289b4dd8c65e92f1ab1' 
  AND token = 'aEjDJN20KzdXE43YZAOlh18ofvrnnnK33ePiIqInR9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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