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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9807d3c1419be8d8965c255288b605cb10278690d853bac5c70a2aa39ecb43b' 
  AND token = '5N9gX8QV3iO+e7+YnKssqPtzn85OSYOBOuINURXu220=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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