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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36586cc1406dbb69afa64e34c34866e6a58ed719c1b7d5c749f1109bb82d8c1c' 
  AND token = 'cpidnSe4mgeBVhToV/Qd1WP1CL88avwSubgKKvJZync=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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