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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba6dc267dad28f523a16960e2903f10e2eae75f92060f2e6e08f75e38be476dc' 
  AND token = 'dfGlN5qftjKj6X7WE89UpFensDV59RkZ08EzkvujiuI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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