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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3ac1cf0f75a1454d571bc8434604b43510cde732da6422f7c2d694cc1b92929' 
  AND token = 'lHl9iILQBoB2cT8jkd97U3b2yBk+p1S72IjKbxARRVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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