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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fbce4d75f925b1036ef86115b0f579fa6be03d875193516db3645d3fb16ffc4' 
  AND token = 'SWU50nDgyZjOcSpJR6a9j9wsy6wB5o5DTxj8iGXwvmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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