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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b72052152b025978e47cdd87af5599186507b54b16bec325b8ec72c81c898da9' 
  AND token = 'frf4+Vul0V1K6TQXhkW3Xcuhi2ncVnzfH0enBtYC9MM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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