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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58556fb15ba5058c95d8ec3d3d43d433a41835136f6b24f027a7e36b282cf04b' 
  AND token = '/4h1wkRpIBuaEYB1yvWtfnqGf5id8cPmyVIEHgLqBDs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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