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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20596fba7dbe4c02768dc74b24f84b870060ff068cdde4680a0c11921b1e2d98' 
  AND token = 'fCrgCquR47B5IV41HzT0xZ8MF2TcSCCWtv4+sZBtLGc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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