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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '609ac86fcaf41fecf94b2cfa90f15c6a1bf88fe118c8e2e1080e0047abb56ec5' 
  AND token = 'vmHL6LampANN4lM6nUsdMVJBHPOC6Zq3XVg3uJHfMjw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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