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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40a436a74781930254f442cd79a8657d811e5ad40f34e1df9ad327e08aa6ff93' 
  AND token = 'NkoiWpT5Yf1CsS1EsWuRsALs/aL28FfJu1OQ5zlzwiw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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