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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32a1e0675c834994b0d0823a68998c327dda879ea47f7e3663473caa1c1a4883' 
  AND token = 'm1hBe02Wc67Tt5UHjCo8j8Mq+fO3pQshGyDgi7j9bp0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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