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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bd6bb82f5a98de84d65ab9d60d3e86763100ddd68a0c79da7a507c933c71bb5' 
  AND token = '1i+H5FYSRC99QgiEE3ivHEe3K6i75ARNWDjG24RCy9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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