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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '058f5ed0c9b051b8a684b6390b62e113d5168ff354a91943e5d94126b84de1e3' 
  AND token = 'AS4gkAHJGLoGUClQyz0rhL1XdDm3kX0AWW5Xu4HaU5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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