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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4aa4fa4a02b07e57a85e7cd9b479b29a32275a99d59042b3596fa02865572310' 
  AND token = 'Ge6Ba8zgiHu4j4UaI7MTY+Y23D4BQv4XvLsbj5Fwvlo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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