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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a99a7635b961bef22f8dede0b9ac67079f26d36729e6bd3c9fe912cd882b5708' 
  AND token = 'sFfJ2ECisUv3eEUFCAjS4eXDTQN0TT2ahmwG68zvOLk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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