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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9db5a0ad2ea666af4fe0aad612a1441dc13061c7fc0d0599599342e75f2cd53' 
  AND token = '7keXtvCi4sycrpYfbkX8MGvu1BT1C71L7gZJP45tDl0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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