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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbfb82ccf4fc006b3ae7eb41f50270afe0cb7a6155cc2c20a3fe2d2f7e3d9c55' 
  AND token = '9kn2uYB9s3FdElgpE8Zx3P1V48YVlr89JO1uNJ6sFGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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