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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d471ca309363b9b41a318c5db7bbed1747c9bf5e5ebc4d651bb11d341baa528' 
  AND token = 'f1ybSkpCJT89rjlH1mNbwYCsFlGZFLa1Ireco0F7bRA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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