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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a494f490939bdb1720304c3079df2f281996b7e91390d008e80eac9149edeff' 
  AND token = 'wxjVDyRRQrrNUHbezHhaV23P0cG3dm9rox0Nu5JJaQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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