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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c87bedcf41d021bc8b3ac98d5c53cb1410406d7745931ddc40eb440dadf1c89' 
  AND token = 'ZlokemyXj6hglLifYzF792Kt9ve4ZdEe5UwmdE3L2DU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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