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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bf4fa163d0c40e230a25390b98e3ac95af5f4212c0f8aba487101e587055c27' 
  AND token = '0BhZdQCyS3aSaW441gPZ87mtzfueb5FaUZ0zOWNhHqE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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