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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbf2374c6880787ae1ee0aaef0ef3922d9abd01de9af4ab7e317fb2bd7d344c1' 
  AND token = 'v/yPOecGHWsCH+7EhenhtLQaaacIJDJ2k2hHyr3th/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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