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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5502ceb85e7a9d570a84faaf87be5f054c360d4fce7e0c7cf881eec11ab05672' 
  AND token = '6zaSg1eqxKStH2Xnmafuq7Bw46dvI9FA2+jzNvGm5nE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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