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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '949c2e1b8ac47c2c002ea23e8e34a1d64d0a348d771e63b2fdde6fd7cdb59b50' 
  AND token = 'F8okSUyV9Hn31AQSjCUqqfjL35maKvMSV8FvxCXA7ok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00068

JSON explain

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