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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58d2d45b3d998fb906c4d3cc53262ceb32f25e5bf33e7c0812c00043bd5c0971' 
  AND token = '4/84aezjE0eO56xlgfMsc58i8q6d5brqAzEwi3HpHuA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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